Nitrofuran derivatives

ABSTRACT

Compounds of the formula   WHEREIN R1 is hydrogen, straight or branched alkyl of one to six carbon atoms, monohydroxy-(alkyl of one to six carbon atoms), or WHERE R4 and R5 are each straight or branched alkyl of one to four carbon atoms, or, together with each other nd the nitrogen atom to which they are attached, morpholino, pyrrolidino, piperidino or N&#39;&#39;-methyl-piperazino, R2 is hydrogen or alkyl of one to three carbon atoms, R3 is hydrogen, straight or branched alkyl of one to five carbon atoms, or monohydroxy-(alkyl of one to five carbon atoms), X is oxygen, imino(-NH-) or methylimino(-NCH3-), X is oxygen; imino(-nH-) or methylimino(-NCH3-), Y is oxygen, sulfur or imino, and N IS 0 OR 1, AND, TO THE EXTENT AHTA THEY CONTAIN ONE OR MORE BASIC NITROGEN ATOMS, NON-TOXIC ACID ADDITION SALTS THEREOF; THE COMPOUNDS A WELL AS THE SALTS ARE USEFUL AS BACTERICIDAL AGENTS AGAINST GRAMPOSITIVE AND GRAMNEGATIVE BACTERIA AND AGAINST TRICHOMONAS.

Stes ate Meier et at.

[451 Feb. 20, 1973 [54] NITROFURAN DERIVAES [75] Inventors: Roland Maier, Biberach/Riss; Robert Sauter, Laupheim, both of Germany [73] Assignee: Boehringer Ingelheim G.m.b.H., In-

gelheim am Rhein, Germany 22 Filed: Sept. 2, 1971 21 Appl.No.:177,435

[52] US. Cl. ..260/244 R, 260/243 R, 260/246 A, 260/247.l, 260/247.5 R, 260/256.4 H,

260/256.5 R, 260/268 PC, 260/268 R,

424 274 [51] Int. Cl. ..C07d 87/06 [58] Field of Search ..260/244,

[ 5 6] References Cited UNITED STATES PATENTS 2,394,068 2/1946 Kendall et a1. ..260/3 10 Primary ExaminerI-Iarry I. Moatz Attorney-Hammond & Littell [57] ABSTRACT Compounds of the formula Y .-H owl CH1) N o I it wherein R is hydrogen, straight or branched alkyl of one to six carbon atoms, monohydroxy-(alkyl of one to six carbon atoms), or

where R, and R are each straight or branched alkyl of one to four carbon atoms, or, together with each other nd the nitrogen atom to which they are attached, morpholino, pyrrolidino, piperidino or N'-methyl-piperazino,

R is hydrogen or alkyl of one to three carbon atoms,

R is hydrogen, straight or branched alkyl of one to five carbon atoms, or monohydroxy-(alkyl of one to five carbon atoms),

X is oxygen, 1m1no(NH) or methylimino(- Y is oxygen, sulfur or imino, and

n is 0 or 1, and, to the extent ahta they contain one or more basic nitrogen atoms, non-toxic acid addition salts thereof; the compounds a well as the salts are useful as bactericidal agents against grampositive and gramnegative bacteria and against trichomonas.

10 Claims, No Drawings NITROFURAN DERIVATIVES This invention relates to novel nitrofuran derivatives and a method of preparing these compounds.

More particularly, the present invention relates to a novel class of compounds represented by the formula wherein R is hydrogen, straight or branched alkyl of one to six carbon atoms, monohydroxy-(alkyl of one to six carbon atoms), or

where R and R are each straight or branched alkyl of one to four carbon atoms, or, together with each other and the nitrogen atom to which they are attached, morpholino, pyrrolidino, piperidino or N'-methyl-piperazino,

R is hydrogen or alkyl of one to three carbon atoms,

R is hydrogen, straight or branched alkyl of one to five carbon atoms, or monohydroxy-(alkyl of one to five carbon atoms),

X is oxygen, imino(NI-I-) or methylimino(- Y is oxygen, sulfur or imino, and

n is or 1, and, to the extent that they contain one or more basic nitrogen atoms, non-toxic, pharmacologically acceptable acid addition salts thereof.

The compounds embraced by Formula I above may be prepared by a number of different methods involving well known chemical principles, among which the following method has proved to be particularly convenient and efficient:

By reacting a compound of the formula wherein X has the same meanings as in Formula I, and

R and R are each alkyl or, together with each other,

alkylene,

with an amine of the formula HY?H(CH;)s(l3HNHR:

R1 R2 (III) The intermediate compound formed by the reaction, of the formula l SR6 OzN c wherein R R R X, Y and n have the same meanings as in Formula I and R has the same meaning as in Formula II, may optionally be isolated and subsequently converted into the corresponding compound of the Formula I, for instance, by heating to a temperature between C. and 200 C. in the presence of a polar organic solvent, such as dimethylsulfoxide.

In those instances where the above-described method yields a compound of the Formula I which comprises one or more basic nitrogen atoms, the basic compound may, if desired, be converted into an acid addition salt thereof by conventional procedures. Examples of non-toxic, pharmacologically acceptable acid addition salts are those formed with hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, acetic acid, tartaric acid, citric acid, fumaric acid, 8- chlorotheophylline or the like.

The starting compounds of the Formula II may be prepared by nitrating a compound of the formula ll C 1 L0 {XLJSRHI wherein X, R and K, have the meanings previously defined.

A compound of the formula V wherein R and R, are

alkyl, in turn, may be prepared by reacting a furan derivative of the formula wherein R is alkyl, A is alkylene, and Z is an anion.

The trithiocarboxonium salts of the Formula VII, in turn, are accessible by alkylation of a cyclic trithiocarbonate with a dialkylsulfate, for example.

(VII) The following examples further illustrate the present invention and will enable others skilled in the art to understand it more completely. It should be understood, however, that the invention is not limited solely to the particular examples given below.

PREPARATION OF STARTING MATERIALS EXAMPLE A 3-(Furyl-2')-4-[(bis-methylmercapto)-methy1ene]- isoxazolone-S 7.9 gm (0.18 mol) of 55 percent sodium hydride were deoiled by decantation with petroleum ether and then suspended in 100 cc of dimethylsulfoxide. While exteriorly cooling the suspension with ice, a solution of 13.5 gm (0.09 mol) of 3-(furyl-2)-isoxazolone-5 and 6.9 gm (0.09 mol) of carbon disulfide in 50 cc of dimethylsulfoxide was slowly added dropwise thereto, and then the mixture was stirred for 30 minutes. Thereafter, while thoroughly cooling, 25.6 gm (0.18 mol) of methyl iodide were added dropwise, and then the resultingmixture was heated for 30 minutes at 50 60 C.'Subsequently, after cooling, the reaction mixture was poured over ice, and the aqueous mixture was extracted with ethyl acetate. The organic phase was dried over sodium sulfate, and the ethyl acetate was evaporated, leaving a red oil which crystallized upon addition of a little ether. 12 gm (53% of theory) of yellow crystalline 3-(furyl-2')-4-[(bis-methylmercapto)- methylene1-isoxazolone-5, m. p. 86 C., of the formula V 1 /SCHa N LO SCH: o

were obtained.

Using an analogous procedure, the following additional starting compounds of the Formula V were prepared:

a. 3-(Furyl-2')-4[(bis-methylmercapto)-methylene] -pyrazolone-5, a red crystalline substance, m. p. 148 C., of the formula was prepared from ethyl furoylacetate and N- methyl-hydrazine.

EXAMPLE B 3-(Furyl-2)-4-[ l ",3 "-dithiacyclopentanylidene-Z" isoxazolone-S 12.1 gm (0.08 mol) of 3-(furyl-2')-isoxazo1one-5 and 42 gm (0.16 mol) of 2-methy1mercapto-l,S-dithiolaniummethylsulfate (prepared by heating a mixture of equimolar amounts of ethylene trithiocarbonate and dimethylsulfate on a water bath) were dissolved in 100 10 17 0 8:; I [1101. wt. 253.3

C-47Al% H-2.78% N-5.53% 5 2532% (347.40% H-2.94% N-5.5 1% S-25.05%

obtained.

Analysis: Calculated: Found:

a. Using an analogous procedure, 3-(fury1-2')-4-[3"- methyl-thiazolidinylidene-2 -isoxazolone-5 m p. 128 C. (from isopropanol), was prepared from 3-(furyl-2)-isoxazolone-5 and 3-methyl-2-methylmercapto-thiazolidiniummethosulfate; the latter was, in turn, prepared from 2-methylmercapto-A2- thiazoline and'dimethylsulfate.

EXAMPLE C Analysis: C H N, O, 8,; mol. wt. 300.32 Calculated: C-40.00% H-2.69% N-9.33% S-2l.35% Found: 039.80% H-2.76% N-9.35% S-21.45%

Using an analogous procedure, the following additional starting compounds of the Formula 11 were prepared:

a 3-(5'-Nitro-fury1-2')-4-[(bis-methylmercapto)- methylene1-pyrazolone-5, reddish-brown crystals, in. p. 164 C., from 3-(furyl-2')-4-[(bis-methylmercapto)-methylenel-pyrazolone-S.

3-( 5 '-Nitro-furyl-2 )-4-[ (bis-methylmercapto)- methy1ene1-l-methyl-pyrazolone-5 yellow crystals, m. p. 200 C., from 3-(furyl-2')-4-[(bismethylmercapto )-m ethylene 1 -methylpyrazolone-S.

c. 3-(5 '-Nitro-furyl-2 )-4-[ l ",3 '-dithiacyclopentanylidene-2"]-isoxazolone-5, brown crystals, m. p. 188 C. (from dimethylformamide/water), from 3-(fury1-2' )-4-[ l ",3' '-dithiacyclopentanylidene-2 ]-isoxazolone-5 EXAMPLE D 3-Morpholino-2-hydroxy-n-propylamine A mixture consisting of 69.5 gm (0.29 mol) of 3- chloro-2-hydroxy-n-propy1phthalimide (see Berichte Deutsch Chem. Ges. 50, 280), 53.2 gm (0.61 mol) of morpholine and 170 cc of ethanol was heated at its boiling point for 6 hours. Thereafter, the ethanol was evaporated, the residue was boiled for 3 hours with 600 cc of aqueous 20% hydrochloric acid, the mixture was allowed to cool and was then vacuum-filtered, the filtrate was concentrated by evaporation to 150 cc, and the concentrate was made strongly alkaline with solid caustic alkali. The oil precipitated thereby was taken up in benzene, and the aqueous phase was extracted twice with benzene. The combined benzene phases were dried over sodium sulfate and then fractionally distilled in vacuo, yielding 17.2 gm of the oily compound, b. p. 146 148 C. at 12 mm Hg, of the formula HO-CH-CHz-NH:

Using an analogous procedure, the following additional starting compounds of the Formula III were prepared:

a. 3-Piperidino-Z-hydroxy-n-propylamine, a colorless oil, b. p. l28-l29 C. at 12 mm Hg, from 3- chloro-Z-hydroxyn-propyl-phthalimide and piperidine.

b. 3'Pyrrolidino-2-hydroxy-n-propy1amine, a colorless oil, b. p. 120-121 C. at 12 mm Hg, from 3'- chloro-2-hydroxy-n-propyl-phthalimide and pyrrolidine.

c. 3-(N'-Methyl-piperazino)-2-l1ydroxy-npropylamine, an oil, b. p. 1l6-l 18 C. at 0.2 mm Hg, from 3-ch1oro-2-hydroxy-n-propyl-phthalimide and N-methyl-piperazine.

d. 3-(Di-n-butylamino)-2-hydroxy-n-propylamine, a

colorless oil, b. p. 101 C. at 0.3 mm Hg, from 3- chloro-2-hydroxy-n-propyl-phthalimide and di-nbutylamine.

e. 3-(Di-isopropylamino)-2-hydroxy-n-propylamine,

a colorless oil, b. p. 95 C. at 0.01 mm Hg, from 3- chloro-2-hydroxy-n-propylphthalimide and diisopropylamine.

PREPARATION OF END PRODUCTS EXAMPLE 1 3-(5 -Nitro-furyl-2 )-4-[oxazolidinylidene-2 ]-isoxazolone-S A mixture consisting of 2 gm (0.0066 mol) of 3-(5- nitro-furyl-Z')-4-[(bis-methylmercapto)-methylene]- isoxazolone-S, 0.41 gm (0.0066 mol) of ethanolamine and 30 cc of acetone was heated at its boiling point for 1 hour. Thereafter, the reaction mixture was allowed to cool, and the precipitate formed thereby was collected by vacuum filtration and washed several times with acetone. 1.4 gm (80% of theory) of the yellowish- 5 crystalline compound, m. p. 263 C. (decomp.),-of the formula 0 l j l J:

o r r were obtained.

Analysis: C H, N 0 mol. wt. 265.19 Calculated: C-45.25%; H-2.66%; N-l 5.87% Found: C-45 .40%; H-2.74%; N-15.70%

lized from dioxane),ofthe formula H l N 3. w j

0 ll J:\N o 1 r was prepared from .3-(5'-nitro-furyl-2)-4-[(bismethylmercapto)-methylene]-isoxazolone-5 ethylenediamine.

and

EXAMPLE 3 was prepared from 3-(5'-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and N-(B- hydroxy-ethyl)-ethylenediamine.

EXAMPLE 4 Using a procedure analogous to that described in Example 1, 3-(5 '-nitro-furyl-2')-4-[3 -(B-hydroxyethyl)-oxazolidinylidene-2"l-isoxazolone-S, m. p. 150 .C. (recrystallized from methanol), of the formula 0 L1,] O onwcm on was prepared from methylmercapto)-methylene]-isoxazolone-5 diethanolamine.

EXAMPLE 5 Using a procedure analogous to that described in Example 1, 3-(5 '-nitro-furyl-2 )-4-[ l -methylimidazolidinylidene-2"]-isoxazolone-5 m. p. 238 C. (decornp.), of the formula (3H3 N l 1 O \N 0 III was prepared from methylmercapto)-methylene]-isoxazolone-5 and N- methyl-ethylenediamine.

(recrystallized from ethylacetate/acetone), of the formula was prepared from 3-(5'-nitro-furyl-2)-4-[(bismethylmercapto)-methylenel-isoxazolonefi and N- methyl-ethanolamine.

EXAMPLE 7 Using a procedure analogous to that described in Example 1, 3-(5'-nitr0-furyl-2')-4-[thiazolidinylidene-Z" ]-isoxazolone-5, m. p. 2l0 C., of the formula was prepared from 3-(5-nitro-furyl-2)-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and cysteamine.

EXAMPLE 8 Using a procedure analogous to that described in Example l, 3-(5'-nitro-furyl-2')-4-[4",5"-dimethyl-oxazolidinylidenc-2"]-isoxazol0ne-5, m. p. 251 C., of the formula was prepared from 3-(5-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and 2- amino-3-hydroxy-n-butane.

EXAMPLE 9 Using a procedure analogous to that described in Example 1, 3-(5 '-nitro-furyl-2 )-4-[5 '-methyl-oxazolidinylidene-Z"]-isoxazolone-5, m. p. 253 C., of the formula was prepared from methylmercapto)-methylene]-isoxazolone-5 amino-2-hydroxy-n-propane.

EXAMPLE 10 Using a procedure analogous to that described in Example l, 3-(5 -nitro-furyl-2')-4-[4"-methyl-oxazolidinylidene-2"]-is0xazolone-5, m. p. 280 C., of

the formula lo Nil- 1%..

was prepared from 3-(5'-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and 2- amin ol -hydroxy-n-propane.

EXAMPLE I 1 Using a procedure analogous to that described in Example l, 3-(5 '-nitro-furyl-2')-4-[ l ",3 "-tetrahydrooxazolinylidene-2"]-isoxazolone-5, m. p. 273 C., of the formula U QD was prepared from 3-(5'-nitro-furyl-2)-4-[(bismethylmercapto)-methylenel-isoxazolone-S and lamino-3-hydroxy-n-propane.

EXAMPLE 12 Using a procedure analogous to that described in Example l, 3-(5'-nitro-furyl-2')-4-[5 "-hydroxymethyloxazolidinylidene-Z"l-isoxazolone-S, m. p. 225 C. (decomp.), of the formula CHzOH was prepared from 3-(5'-nitro-furyl-2)-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and amino-2,B-dihydroxy-n-propane.

EXAMPLE 13 5 Using a procedure analogous to that described in Example 1, 3-(5'-nitro-furyl-2')-4-[5"-isopropyl-oxazolidinylidene-2"]-isoxazolone-5, m.p. 185 C. (recrystallized from ethanol), of the formula O NJ 3-(5'-nitro-furyl-2)-4-[(bisand 1.-

was prepared from methylmercapto)-methylene]-isoxazolone-5 amino-2-hydroxy-3-methyl-n-butane.

ample l, 3-(5-nitro-furyl-2)-4-[5"-isopropyl-4"- methyloxazolidinylidene-2"]-isoxazolone-5, m.p. 204 C. (recrystallized from ethanol/acetone), of the formucumin); U (NV (l o H \N \0 o out was prepared from 3-(5'-nitro-furyl-2')-4-[(bismethylmercapto)-methylenel-isoxazolone-5 and 2- amino-3-hydroxyA-methyl-n-pentane.

EXAMPLE 16 Using a procedure analogous to that described in Example l, 3-(5 -nitro-furyl-2 ')-4-[1' '-ethylimidazolidinylidene-Z"]-isoxazolone-5, m.p. 235 C. (decomp.), of the formula CzHs was prepared from 3-(5-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and N- ethyl-ethylene-diamine.

EXAMPLE 17 Using a procedure analogous to that described in Example l, 3-(5-nitro-furyl-2)-4-[3"-ethyl-oxazolidinylidene-2"]-isoxazolone-5, m.p. 166 C. (recrystallized from ethanol), of the formula 0 ioioyi was prepared from 3-(5'-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and N- ethyl-ethanolamine.

EXAMPLE 18 Using a procedure analogous to that described in Example l, 3-(5'-nitro-furyl-2')-4-[hexahydropyrimidinylidene-2"l-isoxazolone-S, m.p. 243 C. (decomp.), of the formula was prepared from 3-(5-nitro-furyl-2)-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and 1,3- diamino-n-propane.

EXAMPLE l9 Using a procedure analogous to that described in Example l, 3-( 5 '-nitro-furyl-2' )-4-[ 5 '-n-hexyl-oxazolidinylidene-2"]-isoxazolone-5, m. p. C. (recrystallized from ethanol), of the formula was prepared from 3-(5-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and lamino-2-hydroxy-n-octane.

n- (2 ll EXAMPLE 20 Using a procedure analogous to that described in Ex ample l, 3-(5 -nitro-furyl-2' )-4-[5 "-n-pentyl-ox- WES azolidinylidene-2"]-isoxazolone-5, m. p. 165 C., of the formula oj OzNl 'C/ 0 i I N N 1 was prepared from 3-(5-nitro-furyl-2)-4-[(bismethylmercapto)-rnethylene]-isoxazolone-5 and 1- arnino-Z-hydroxy-n-heptane.

EXAMPLE 21 Using a procedure analogous to that described in Example 1, 3-(5 -nitro-furyl-2' )-4-[4' '-ethyl-S methyloxazolidinylidene-Z]-isoxazolone-5, m. p. 222

methylmercapto)-methylene1-isoxazolone-5 and 3- amino-2-hydroxyn-pentane.

EXAMPLE 22 Using a procedure analogous to that described in Example 1, 3-(5 '-nitro-furyl-2')-4-[4"-ethyl-oxazolidinylidene-2"l-isoxazolone-S, m. p. 246 C., of the formula 3-( 5 '-nitro-furyl-2 )-4-[ (bisand 2- was prepared from methylmercapto )-methylene]-isoxazolone-5 amino-1-hydroxy-n-butane.

EXAMPLE 23 Using a procedure analogous to that described in Example l, 3-(5 -nitro-furyl-2 ')4-[ l "-methyl-hexahydropyrimidinylidene-2"l-isoxazolone-S, m. p. 225

C. (decomp.), of the formula I (EH:

N OzNl O i J: \N

& 1'.

prepared from 3-(5-nitro-furyl-2)-4-[(bismethylmercapto)-methylene]-isoxazo1one-5 and N- methyl-l ,3 -diamino-n-propane.

EXAMPLE 24 Using a procedure analogous to that described in Ex- 5 ethyl)-thiazolidinylidene-2"]-isoxazolone-S, m. p. 188

C. (decomp. of the formula J IQI I CHr-CHzOH was prepared from 3-(5'-nitro-furyl-2')-4-[(bismethylmercapto )-rnethylene]-isoxazolone-5 and N-(B- hydroxy-ethyl )-cyste amine.

EXAMPLE 25 Using a procedure analogous to that described in Example l, 3-(5 '-nitro-furyl-2' )-4-[ 3 '-(B-hydroxy-npropyl)-5 -methyl-oxazolidinylidene-2 1 -isoxazolone- 5, m. p. l C. (recrystallized from isopropanol), of the formula KJIT (214111.

30 CHz-CH-CH:

was prepared from 3-(5 '-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazol0ne-5 and di-(B- hydroxy-n-propyl)-amine.

EXAMPLE 26 Using a procedure analogous to that described in Example 1, 3-(5 -nitro-furyl-2')-4-[3"-n-butyl-oxazolidinylidene-2" ]-isoxazolone-5, m. p. 1 10 C. (recrystallized from ethanol), of the formula UTE? was prepared from 3-(5 -nitro-furyl-2')-4-[(bisrnethylmercapto)-methylene]-isoxazolone-5 and N-nbutyl-ethanolamine.

EXAMPLE 27 Using a procedure analogous to that described in Example l, 3-(5 -nitro-furyl-2' )-4-[ l "-n-propylimidazolidinylidene-Z"1-isoxazolone-S, m. p. 200 C. (recrystallized from dioxane), of the formula TlQ was prepared from 3-(5'-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and N-npropyl-ethylenediamine. EXAMPLE 28 Using a procedure analogous to that described in Example 1, 3-(5 '-nitro-furyl-2')-4-[3 "-(B-hydroxy-npropyl )-oxazolindylidene-2' -is oxazolone-5 m. 153 C. (recrystallized from ethanol), of the formula was prepared from 3-(5'-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and N-(B hydroxy-n-propyl)-ethanolamine.

EXAMPLE 29 Using a procedure analogous to that described in Example 1, 3-(5'-nitro-furyl-2')-4-[3-(y-hydroxy-npropyl)-oxazolidinylidene-2"]-isoxazolone-5, m. 185 C. (recrystallized from ethanol), of the formula 0 oHPoHl-oHmH methylmercapto )-methylene]-isoxazoloneand N-(yhydroxy-n-propyl)-ethanolamine.

EXAMPLE 30 Using a procedure analogous to that described in Example 1, 3-(5"-nitro-furyl-2)-4-[3"-(B-methyl-n-butyl)-oxazolidinylidene-2"1-isoxazolone-5, m. p. 140 C. (recrystallized from ethanol), of the formula was prepared from 3-(5-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and N-(B- methyl-n-butyl)-ethanolamine.

EXAMPLE 31 Using a procedure analogous to that described in Example l, 3-(5'-nitro-furyl-2)-4-[3",5"-dimethyl-oxazolidinylidene-2]-isoxazolone-5, m. p. 196 C., of the formula was prepared from 3-(5'-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and 1- methylamino-Z-hydroxy-propane.

EXAMPLE 32 Using a procedure analogous to that described in Example l, 3-(5'-nitro-furyl-2')-4-[3"-isopropyl-oxazolidinylidene-Z]-isoxazolone-5, m. p. 198 C., of the formula 1' l 0 N --C j 2 O I \N was prepared from 3-(5-nitro-furyl-2)-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and N- isopropyl-ethanolamine.

EXAMPLE 33 Using a procedure analogous to that described in Example 1, 3-( 5 '-nitro-furyl-2 )-4-[imidazolidinylidene- 2"]-isoxazolone-5, m. p. 275 C. (decomp; recrystallized from dioxane), of the formula N OrN j 0 l III was prepared from 3-(5'-nitro-furyl-2)-4-[1,3"- dithiacyclopentanylidene-2"]-isoxazolone-5 and ethylenediamine.

EXAMPLE 34 Using a procedure analogous to that described in Example l, 3-(5 '-nitrofuryl-2 )-4-[ 5 -metl1yl-oxazolidinylidene-2"l-pyrazolone-S, m. p. 275 C. (decomp; recrystallized from ethanol), of the formula /CH O O NJ j 0 N I: 1 N 3 was prepared from 3-(5-nitro-furyl-2)-4-[(bismethylmercapto)-methylenel-pyrazolone-S and lamino-2-hydroxy-n-propane.

EXAMPLE 35 Using a procedure analogous to that described in Example 1, 3-(5'-nitro-furyl-2')-4-[thiazolidinylidene-Z" ]-pyrazolone-5, m. p. 287 C. (recrystallized from dimethylformamide), of the formula OzNJ EXAMPLE 36 Using a procedure analogous to that described in Example l 3-( 5 -nitro-furyl-2 )-4-[5 "-methyl-oxazolidinylidene-2"]-l-methyl-pyrazolone-5, m. p. 274-275 C. (recrystallized from ethanol), of the formula I CHa was prepared from 3 -nitro-furyl-2 )-4-[ (bis-. methylmercapto)-methylene]-1-methyl-pyrazolone-5 and 1-amino-2-hydroxy-n-propane.

EXAMPLE 37 3-(5 '-Nitro-furyl-2' )-4-[1 ',3 "-tetrahydrooxazinylidene-2]-isoxazolone-5 a 2.0 gm (0.0066 mol) of 3-(5-nitro-furyl-2)-4- [(bis-m ethylm ercapto )-methylene]-isoxazolone-5 were suspended in 30 cc of ethanol, and 0.52 gm (0.007 mol) of 3-hydroxy-n-propylarnine were added to the suspension. Everything gradually went into solution, accompanied by evolution of mercaptan.-After minutes of standing the solution was evaporated, and the residue was recrystallized from ethanol, yielding 1.2 gm of 3-(5-nitr0- furyl-Z 4-[ (methylmercapto)-(y-hydroxy-npropylamino)-methylene]-isoxazolone-5, m. p. 168' C.

. A mixture of 0.3 gm of this compound and 3 cc of dimethylsulfoxide was heated at its boiling point for 5 minutes and then allowed to cool, and the precipitate formed thereby was collected by vacuum filtration and washed with ether. 150 mgm of the same compound as in Example 11, m. p. 275-280 C., were obtained.

EXAMPLE 38 3-( 5 '-Nitro-furyl-2' )-4-[5 '-(dimethylamino-methyl)- oxazolidinylidene-2 -isoxazolone-5 were obtained.

Analysis: C H N 0;; .mol. wt. 322.3 I Calculated: C-48.45%; H-4.38%; N-l'l.37% Found: C-48.50%; H-4.43%; N- l 7.40%

lts hydrochloride, obtained by treating the free base with hydrochloric acid, had a melting point of 1-25 3 C.

Its tartrate, obtained by treating the free base with tartaric acid, had a melting point of 160-165 C.

EXAMPLE 39 Using a procedure analogous to that described in Example 38, 3-(5 '-nitro-furyl-2)-4-([5 (diethylaminomethyl)-oxazolidinylidene-2 -isoxazolone-S m. p. 204 C., of the formula N I L,

was prepared from 3-(5'-nitro-furyl-2-)4-[(bismethylmercapto)-methylene]-isoxazolone-S and 3- diethylamino-Z-hydroxy-n-propylamine.

EXAMPLE 40 Using a procedure analogous to that described in Example 38, 3-(5 '-nitro-furyl-2'-(4-(5 "-(piperidinomethyl)-oxazolidinylidene-2"]-isoxazolone-5, m. p.

was prepared from 3-(5'-nitro-furyl-2-4-[(bis-methylmercapto)-methylene]-isoxazolone-5 and 3- piperidino-Z-hydroxy-n-propylamine.

EXAMPLE 41 Using a procedure analogous to that described in Example 38, 3-(5-nitro-furyl-2')-4-{5"-(pyrrolidinomethyl)-oxazolidinylidene 205 C., of the formula 2"1-isoxazolone-5, m.p.

was prepared from 3-(5-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and 3-pyrrolidino-Z-hydroxy-n-propylamine.

piperazinomethyl)-oxazolidinylidene-2' ']-isoxazolone- 5, m.p. 146 C, of the formula {Disiwas prepared from 3-(5'-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone- (N'-methylpiperazino)-2-hydroxy-n-propylarnine.

N CHa EXAMPLE 43 Using a procedure analogous to that described in Example 38, 3-(5-nitro-furyl-2')-4-[5"-(morpholinomethyl)-oxazolidinylidene-2 ]-isoxazolone-5 m.p. 220 C. of the formula N I l H was prepared from 3-(5'-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and 3- morpholino-2-hydroxy-n-propylamine.

EXAMPLE 44 Using a procedure analogous to that described in Example 3 8, 3-(5 -nitro-furyl-2')-4-( 5 '-(di-n-butylaminomethyl)-oxazolidinylidene-2"]-isoxazolone-5, m.p. 142 C., of the formula was prepared from 3-(5'-nitro-furyl-2)-4-[(bismethylmercapto)-methylene]-isoxazo|one-5 and 3-(din-butylamino)-2-hydroxy-n-propylamine.

EXAMPLE 45 Using a procedure analogous to that described in Example 38, 3-(5 -nitro-furyl-2)-4-[5"-( diisopropylaminomethyl)-oxazolidinylidene-2 ]-isoxazolone-S, m.p. 183 C., of the formula and 3- was prepared from 3-(5-nitro-furyl-2')-4-[(bismethylmercapto)-methylene]-isoxazolone-5 and 3-( diisopropylamino)-2-hydroxy-n-propylamine.

EXAMPLE 46 Using a procedure analogous to that described in Example 38, 3-(5'-nitro-furyl-2')-4-[5"(dimethylaminom ethyl)-3 -methyl-oxazolidinylidene-2 -isoxazolone- 5, m.p. 96 C., of the formula was prepared from 3-(5-nitro-furyl-2)-4-[(bismethylrnercapto)-methylene]-isoxazolone-5 and 3- diethylamino-2-hydroxy-N-methyl-n-propylamine.

EXAMPLE 47 Using a procedure analogous to that described in Example 38, 3-(5'-nitro-furyl-2)-4-[5"-(dimethylaminomethyl)-oxazolidinylidene-2"]-isoxazolone-5, m.p. 192 C., was prepared from 3-(5'-nitro-furyl-2')-4- 1 ",3-dithiacyclo-pentanylidene)-2" ]-isoxazolone-5 and 3-dimethylamino-2-hydroxy-n-propylamine.

The compounds according to the present invention, that is, those embraced by formula I above and, if they contain a basic nitrogen atom, non-toxic acid addition salts thereof, have useful pharmacodynamic properties. More particularly, the compounds of the instant invention exhibit anti-bacterial activities and are especially effective against grampositive and gramnegative bacteria, such as Staphylococcus aureus and Escherichia coli, as well as against trichomonads, especially Trichomonas vaginalis.

For instance, the following specific compounds are effective against Staphylococcus aureus and Escherichia coli within concentration ranges as low as 06-20 'y/ml and 0.16-20 y/ml, respectively:

A. 3-(5 -Nitro-furyl-2' )-4-[imidazolidinylidene-Z" isoxazolone-S 3-( 5 '-Nitro-furyl-2 )-4-[oxazolidinylidene-2 isoxazolone-S, C. 3-(5 '-Nitro-furyl-2 )-4-( 3 "-methyl-oxazolidinylidene-2"]-isoxazolone-5,

3-(5'-nitro-furyl-2)-4-[thiazolidinylidene-2"- isoxazolone-S,

3-( 5 -Nitro-furyl-2 )-4-[5 -methyl-oxazolidinylidene-2"]-isoxazolone-5,

3 5 -Nitro-furyl-2 )-4-[4 -methyl-oxazolidinylidene-2"]-isoxazolone-5,

3-(*5'-Nitro-furyl-2)-4-[3-(B-hydroxy-ethyl)- oxazolidinylidene-Z ]-isoxazolone-5 3-( 5 '-Nitro-furyl-2 )-4-[ l ',3 '-tetrahydrooxazinylidene-2"]-isoxazolone-5, and I. 3-(5'-Nitro-furyl-2')-4-[5"-(dimethylaminomethyl)-oxazolidinylidene-2"]-isoxazolone-5.

Compounds (B), (D), (E) and (F) are also very efv'erition are administered to warm-blooded animals topically or perorally as active ingredients in customary pharmaceutical compositions, that is, compositions consisting essentially of an inert pharmaceutical carrier and an effective amount of the active ingredient, such as tablets, coated pills, capsules, wafers, powders, solu- K035 Ens pensions, emulsions, syrups, suppositories, vaginal tablets and the like. One effective peroral dosage unit of the compounds according to the present invention is from 0.167 to 2.5 mgm/kg body weight, preferably 0.83 to 1.67 mgm/kg body weight.

For topical administration, the preferred concentration is about 1% by weight, based on the total weight of the composition,

The following examples illustrate a few pharmaceutical compositions comprising a compound of the present invention as an active ingredient and represent the best modes contemplated of putting the invention into practical use, The parts are parts by weight unless otherwise specified.

EXAMPLE 48 Tablets The tablet composition is compounded from the following ingredients:

2"]-isoxazolone-5- 100.0 parts Lactose 63.0 Potato starch 50.0 Polyvinylpyrrolidone 5.0 Magnesium stearate 2.0 tz

Total 220.0 parts Preparation:

220'mgm-tablets in a conventional tablet making EXAMPLE 49 Coated pills The pill core composition is compounded from the following ingredients:

2"1-isoxazolone-5 500 parts Lactose 30.0 Corn starch 30.0 Gelatin 3.0 Cellulose, microcrystalline 6.0 Magnesium stearate L0 Total 120.0 parts Preparation:

The isoxazolone compound, the lactose and the corn starch are intimately admixed with each other, the mixture is moistened with an aqueous 12% solution of the gelatin, the moist mass is forced through a 1.5 mmmesh screen, the resulting granulate is dried at 45 C. and again passed through a 1.0 mm-mesh screen, the dry granulate is admixed with the cellulose and the magnesium stearate, and the composition is compressed into mgm-pill cores, which are subsequently coated with a thin shell consisting essentially of a mixture of sugar and talcum, and polished with beeswax. Each coated pill contains 50 mgm of the isoxazolone compound and is an oral dosage unit composition with effective antibacterial action.

EXAMPLE 50 Vaginal tablets The tablet composition is compounded from the following ingredients:

The isoxazolone compound, the sorbitol and the carboxymethyl cellulose are intimately admixed with each other, the mixture is moistened with aqueous 50% ethanol gm per 1,000 tablets), the moist mass is granulated through a 2 mm-mesh screen, the granulate is dried at 45 C. and again passed through the screen, the dry granulate is admixed with the magnesium stearate, and the composition is compressed into 1,000 mgm-tablets. Each tablet contains 100 m gm of the isoxazolone compound and is an intra-vaginal dosage unit composition with effective anti-trichomonal action.

EXAMPLE 5! Tincture The tincture is compounded from the following ingredients:

L0 parts 99.0

Total 100.0 parts Preparation:

The isoxazolone compound is dissolved in the polyethyleneglycol by heating, and the solution is cooled to room temperature and then filtered. The resulting tincture contains 1% by weight of the isoxazolone compound and is a topical composition with effective anti-bacterial action.

The same result is obtained when an equal amount of 3-(5 '2'-4-[5 "-(dimethylamino-methyl)-oxazolidinylidene-2"l-isoxazolone-S or a non-toxic acid addition salt thereof is substituted for 3-(5'-nitro-furyl- 2' )-4-[ 3 '-(B-hydroxy-ethyl)-oxazolidinylidene-2' isoxazolone-5.

EXAMPLE 52 Lotio'n The suspension is compounded from the following ingredients:

The ingredients, except the active substance and the water, are admixed with each other, and the mixture is melted, brought to 70 C., and then emulsified into the distilled water at the same temperature. The resulting aqueous emulsion is cooled to 40 C., and the finely milled isoxazolone compound is suspended therein with the aid of an immersion homogenizer. The finished composition is then cooled to room temperature. The resulting lotion, which must be thoroughly shaken before use, contains 1% by weight of the isoxazolone compound and is a topical composition with effective anti-bacterial action.

The same result is obtained when an equal amount of 3-(5'2')-4-[5"-(dimethylamino-methyl)- oxazolidinylidene' 2"']-isoxazolone-5 or a non-toxic acid addition salt thereof is substituted for 3-(5-nitrofuryl-2')-4-[3 "-(}8-hydroxy-ethyl)-oxazolidinylidene EXAMPLE 53 Coated pills The pill core composition is compounded from the following ingredients:

-isoxazolone-5 50.0 parts Papaverine 25.0 Corn starch 32.0 Gelatin 3.0 Cellulose, microcrystalline 9.0 Magnesium stearate 1.0

Total 120.0 parts Preparation:

'with beeswax. Each coated pill contains 50 mgm of the isoxazolone compound and 25 mgm of papaverine, and is an oral dosage unit composition with effective antibacterial an muscle-relaxing actions.

The same result is obtained when an equal amount of 3-(52' )4-[5"-dimethylamino-methyl)-oxazolidinylidene-2"]-isoxazolone-5 or a non-toxic acid addition salt thereof is substituted for 3-(5-nitro-furyl- 2')4-[3"-(B-hydroxy-ethyl)-oxazolidinylidene-2"]- isoxazolone-5.

Analogous results are obtained when any one of the other nitrofuran derivatives embraced by Formula I, or a non-toxic acid addition salt thereof, is substituted for the particular isoxazolone compound in Examples 48 to 53. Likewise, the amount of active ingredient in these illustrative examples may be varied to achieve the dosage unit range set forth above, and the amounts and nature of the inert pharmaceutical carrier ingredients may be varied to meet particular requirements.

While the present invention has been illustrated with the aid of certain specific embodiments thereof, it will be readily apparent to others skilled in the art that the invention is not limited to these particular embodiments, and that various changes and modifications may be made without departing from the spirit of the invention or the scope of the appended claims.

We claim:

1. A compound of the formula wherein R is hydrogen, alkyl of one to six carbon atoms, monohydroxy-(alkyl of one to six carbon atoms),or

where R and R are each alkyl of one to four carbon atoms, or, together with each other and the nitrogen atom to which they are attached, morpholino, pyrrolidino, piperidino or N'- rnethyl-piperazino, R is hydrogen or alkyl .of one to three carbon atoms, R is hydrogen, alkyl of one to five carbon atoms, or

monohydroxy-(alkyl of one to five carbon atoms), X is oxygen, imino or methylimino, Y is oxygen, sulfur or imino, and n is or 1, or, when R, is CI-l --NR R as defined above, a nontoxic, pharmacologically acceptable acid addition salt thereof.

2. A compound according to claim 1, which is 3-(5 nitro-furyl-Z )-4-( im idazolidinylidene-Z )-isoxazolone-S.

3. A compound according to claim 1, which is 3-(5 nitro-furyl-Z '-4-(oxazolidinylidene-2 )-isoxaz0lone-5.

4. A compound according to claim 1, which is 3-(5-' nitro-furyl-Z )-4-( 3 '-methyl-oxazolidinylidene-2 isoxazolone-S.

S. A compound according to claim 1, which is 3-(5'- nitro-furyl-2' )-4-thiazolidinylidene-2 )-isoxazolone-5.

6. A compound according to claim 1, which is 3-(5'- nitro-furyl-Z )-4-( 5 -methyl-oxazolidinylidene-2 isoxazolone-S.

7. A compound according to claim 1, which is 3-(5 nitro-furyl-Z )-4-4 '-rnethyl-oxazolidinylidene-Z isoxazolone-S.

8. A compound according to claim 1, which is 3-(5'- nitrofuryl-2 )-4-[ 3 '-([3-hydroxy-ethyl)-oxazolidinylidene-Z -isoxazolone-5v 9. A compound according to claim 1, which is 3-(5- nitro-furyl-2')-4-(1",3"2")- isoxazolone-S.

10. A compound according to claim 1, which is 3-(5' -nitro-furyl-2 )-4-[ 5 '-(dimethylamino-methyl )-oxazolidinylidene-Z"]-isoxazolone-5 or a non-toxic, pharmacologically acceptable acid addition salt thereof.

@23 UNITED STATES PATENT OFFICE CERTIFIC-giTE OF CORRECTION 3,717, 29 Dated Feb. 20, 1973 l ROLAND MAIER and ROBERT SAUTER It is certified that error appears inthe aboveeidentified patent I and that said Letters Patent are hereby corrected as "shown below:-

Col. 16,, line 25 correct 2'-) to read -2. )-H-- L 4 correct "-2' l-" to read --2')- l 63 before "pharmaceutical" insert --'For-+-.. Co l.- 19, line 2 -'fcorrect "-zj-u to read ,-2") l- H H "tZ"; I 49- before "\2'. insert---'-nitrofury1--.

Col 21, line 1 1 "correct "2" to read- -lnitro-furyl-2")---;

" e 28 -correct "5" to read 5' 59 before- "2' insert nitro-furYl- Col. 22 line 40 before ."2'" insert }-n itrofuryl l CO1: li1'l6 1H insert Y b f Run 11 i '1 .2 'e "2' "'insert tetrahydw- I 'oxaz'infylidenei "si n and sealed this 9th day of April 1971;.

EDWARD M.FIETCHER,Ji-i. c; MARSHALL DANN I Attesting Officer Commissioner of Pategmts 4 1 i 

1. A compound of the formula
 2. A compound according to claim 1, which is 3-(5''-nitro-furyl-2'')-4-(imidazolidinylidene-2'''')-isoxazolone-5.
 3. A compound according to claim 1, which is 3-(5''-nitro-furyl-2''-4-(oxazolidinylidene-2'''')-isoxazolone-5.
 4. A compound according to claim 1, which is 3-(5''-nitro-furyl-2'')-4-(3''''-methyl-oxazolidinylidene-2'''')-isoxazolone-5.
 5. A compound according to claim 1, which is 3-(5''-nitro-furyl-2'')-4-thiazolidinylidene-2'''')-isoxazolone-5.
 6. A compound according to claim 1, which is 3-(5''-nitro-furyl-2'')-4-(5''''-methyl-oxazolidinylidene-2'''')-isoxazolone-5.
 7. A compound according to claim 1, which is 3-(5''-nitro-furyl-2'')-4-4''''-methyl-oxazolidinylidene-2'''')-isoxazolone-5.
 8. A compound according to claim 1, which is 3-(5''-nitro-furyl-2'')-4-(3''''-( Beta -hydroxy-ethyl)-oxazolidinylidene-2'''')-isoxazolone-5.
 9. A compound according to claim 1, which is 3-(5''-nitro-furyl-2'')-4-(1'''',3''''-tetrahydrooxazinylidene-2'''')-isoxazolone-5. 